用两个这个就可以了吧
<img onDblClick="shuchu()" src="JavaScrip_app/1.jpg" width="538" height="396" border="0">
<img onClick="getCoordinate()" src="JavaScrip_app/1.jpg" width="538" height="396" border="0">
<img onDblClick="shuchu()" src="JavaScrip_app/1.jpg" width="538" height="396" border="0">
<img onClick="getCoordinate()" src="JavaScrip_app/1.jpg" width="538" height="396" border="0">
//alert("鼠标点击的位置的坐标是:("+x+","+y+")");